<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
        <!-- 警示区域 -->
        <el-alert show-icon :closable="false" title="警告提示的文案" type="warning"></el-alert>
        <!-- 选择商品分类区域 -->
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" v-model="selectedCateKeys" @change="handleChange"></el-cascader>
            </el-col>
        </el-row>
        <!-- tab页签区域 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <el-tab-pane label="动态参数" name="many">
                <!-- 添加动态参数的面板 -->
                <el-button @click="addDialogVisible=true" type="primary" :disabled="isBtnDisabled" size="mini">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag closable @close="handleClose(i,scope.row)" v-for="(item, i) in scope.row.attr_vals" :key="i">{{item}}</el-tag>
                            <!-- 输入框 -->
                            <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                            </el-input>
                            <!-- 添加的按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <el-tab-pane label="静态属性" name="only">
                <!-- 添加静态属性的面板 -->
                <el-button @click="addDialogVisible=true" type="primary" :disabled="isBtnDisabled" size="mini">添加属性</el-button>
                <!-- 静态参数表格 -->
                <el-table :data="onlyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag closable @close="handleClose(i,scope.row)" v-for="(item, i) in scope.row.attr_vals" :key="i">{{item}}</el-tag>
                            <!-- 输入框 -->
                            <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                            </el-input>
                            <!-- 添加的按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini"  @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
        @close="addDialogClosed"
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        width="50%">
        <!-- 添加参数的对话框 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
    <el-dialog
        @close="editDialogClosed"
        :title="'修改' + titleText"
        :visible.sync="editDialogVisible"
        width="50%">
        <!-- 添加参数的对话框 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
        //商品分类列表
        catelist:[],
        //级联选择框的配置对象
        cateProps:{
            value:'cat_id',
            label:'cat_name',
            children:'children'
        },
        //级联选择框双向绑定到的数组
        selectedCateKeys:[],
        //被激活的页签的名称
        activeName:'many',
        //动态参数的数据
        manyTableData:[],
        //静态属性的数据
        onlyTableData:[],
        //控制添加对话框的显示与隐藏
        addDialogVisible:false,
        //添加参数的表单对象
        addForm:{
           attr_name:''
        },
        //添加表单的验证规则对象
        addFormRules: {
             attr_name: [
                { required:true, message:'请输入参数名称', trigger:'blur' }
            ]
        },
        //控制修改对话框的显示
        editDialogVisible:false,
        //修改的表单数据对象
        editForm:{},
        //修改表单的验证规则对象
        editFormRules:{
            attr_name: [
                { required:true, message:'请输入参数名称', trigger:'blur' }
            ]
        },

    }
  },
  created(){
      this.getCateList()
  },
  computed:{
    isBtnDisabled(){
        if(this.selectedCateKeys.length !==3){
            return true
          }
          return false
      },
      //当前选中的三级分类id
    cateId(){
            if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }
            return '静态属性'
        }
    
    },
  methods: {
      //获取所有的商品分类列表
      async getCateList(){
          const { data: res} = await this.$http.get('categories')
          if(res.meta.status !==200){
              return this.$message.error('获取商品分类失败！')
          }
          this.catelist = res.data
      },
      //级联选择框选中项变化，会触发这个函数
      handleChange(){
          this.getParamsData()
      },
      //Tab 页签点击事件处理函数
      handleTabClick(){
          this.getParamsData()
      },
      //获取参数列表的数据
      async getParamsData(){
          if(this.selectedCateKeys.length !== 3){
              this.selectedCateKeys = []
              this.manyTableData = []
              this.onlyTableData = []
              return
          }
          //证明选中的是三级分类
            console.log(this.selectedCateKeys)
          //根据所选分类的id，和当前所处的面板，获取对应的参数
          const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,{ params: { sel: this.activeName }})
          if( res.meta.status !==200 ){
              return this.$message.error('获取参数列表失败！')
          }
          
          //把item.attr_vals循环变成数组
          res.data.forEach(item =>{
            item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
            //控制文本框显示与隐藏
            item.inputVisible = false
            //文本框输入的值
            item.inputValue = ''
          })
          console.log(res.data)
          if(this.activeName === 'many'){
              this.manyTableData = res.data
          }else{
              this.onlyTableData = res.data
          }
      },
      //监听对话框关闭事件
      addDialogClosed(){
          this.$refs.addFormRef.resetFields()
      },
      //添加参数
      addParams(){
          this.$refs.addFormRef.validate(async valid =>{
              if(!valid) return
              const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                  attr_name:this.addForm.attr_name,
                  attr_sel:this.activeName
              })
              if(res.meta.status !==201){
                  return this.$message.error('添加参数失败')
              }
              this.$message.success('添加参数成功')
              this.addDialogVisible = false
              this.getParamsData()
          })
      },
      //展示修改的对话框
      async showEditDialog(attr_id){
          const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params: {attr_sel:this.activeName}})
          if(res.meta.status !==200){
              return this.$message.error('获取参数信息失败！')
          }
          this.editForm = res.data
          this.editDialogVisible = true
      },
      //重置修改的表单
      editDialogClosed(){
          this.$refs.editFormRef.resetFields()
      },
      //点击按钮，修改参数信息
      editParams(){
          this.$refs.editFormRef.validate(async valid =>{
              if(!valid) return
              const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{attr_name:this.editForm.attr_name,attr_sel:this.activeName})
              if(res.meta.status !==200){
                  return this.$message.error('修改参数失败！')
                
              }
              this.$message.success('修改参数成功！')
              this.getParamsData()
              this.editDialogVisible = false
          })
      },
      //根据id删除对应的参数项
      async removeParams(attr_id){
          const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        if(confirmResult !=='confirm'){
            return this.$message.info('已取消删除！')
        }
        //删除业务逻辑
        const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if(res.meta.status !==200){
            return this.$message.error('删除参数失败！')
        }
        this.$message.success('删除参数成功！')
        this.getParamsData()
      },
      //文本框失去焦点，或摁下enter，都会触发
      async handleInputConfirm(row){
          if(row.inputValue.trim().length ===0){
              row.inputValue = ''
              row.inputVisible = false
              return
          }
          //如果没有renturn，证明输入了内容，后续处理
          row.attr_vals.push(row.inputValue.trim())
          row.inputValue = ''
          row.inputVisible = false
          //需要发起请求，保存到数据库
          this.saveAttrVals(row)
      },
      //点击按钮，展示文本输入框
      showInput(row){
          row.inputVisible = true
          //让文本框自动获得焦点
          this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus()
        })
      },
      //将对attr_vals 的操作，保存到数据库
      async saveAttrVals(row){
          //需要发起请求，保存到数据库
          const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
              attr_name: row.attr_name,
              attr_sel: row.attr_sel,
              attr_vals: row.attr_vals.join(' ')
          })
          if(res.meta.status !==200){
              return this.$message.error('修改参数失败！')
          }
          this.$message.success('修改参数成功！')
      },
      //删除对应的参数可选项
      handleClose(i,row){
          row.attr_vals.splice(i,1)
          this.saveAttrVals(row)
      }

  }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 10px 15px;
}
.el-tag{
    margin: 5px 5px;
}
.input-new-tag{
    width: 120px;
}
</style>
